Something to say when someone is being rude or putting something in your face, and you want them to back off. Or when someone is coming on too strong with their attitude. Comes from the movie Nacho Libre starring Jack Black when his friend offers him a Corn-on-a-stick.
to cheer some one on in a way as if there doing a good job at what ever they happen to be doing , to motavte someone to continue what ever they are doing say if there danceing,fighting,getting a number from a girl/boy.